Nvidia had a big partner thing in Lisbon Portugal and some key people even talked about 28nm chips and have confirmed that some of Nvidia’s 28nm notebook chips are almost ready for production even today. Far East sources are confirming this independently.
The yields are the factor that will decide when wills this actually happen but it all indicates that 28nm notebook chips should be on time to launch with Ivy Bridge 22nm notebooks. Some of these chips might show up as a part of Sandy Bridge, but this will depend on yields on 28nm and Nvidia will try to calculate if it makes sense to launch it before.
The design notebook GPUs usually starts from the ground up, or roughly from the middle and faster chips are introduced at a later date. For example, Nvidia launched GF108 based GT525M, GT540M and GT 550M at CES of January 5th 2011 together with GF106 based Geforce GT 555 M while the Geforce GTX 560 performance part launched in very late May (Computex 2011) and GTX 580M (high end) launched in late June.
We expect a similar scenario with Geforce 600 series mobile launch scenario and to see the mainstream and entry level first and the performance and high end to follow in a few months later.
At least one of these 28nm chips is finished and it seems to be in good shape.